Subsea universal Xmas tree hang-off adapter

Abstract

Adapter ( 15 ) for an oil or gas field Christmas tree ( 4 ), said adapter ( 15 ) comprising a first interface ( 16 ) to connect the adapter ( 15 ) to a corresponding Christmas tree interface ( 17 ) on the top of the Christmas tree ( 4 ), distinctive in that the adapter ( 15 ) further comprises a second interface ( 18 ), at least one feed-through, and at least one of: a well barrier element, an internal profile for setting a plug, a hanger or a combined hanger and plug.

The invention claimed is: 
     
       1. An adapter for an oil or gas field Christmas tree, said adapter comprising:
 a first interface to connect the adapter to a corresponding Christmas tree interface on a top of the Christmas tree; 
 a second interface; 
 at least one feed-through configured to convey electric power; 
 at least one of: a well barrier element, an internal profile for setting a plug, or a combined hanger and plug; 
 wherein said second interface is identical to the Christmas tree interface, and said second interface is at an end of the adapter opposite of said first interface; and 
 wherein the adapter comprises a string hanging down from a lower well barrier within the adapter, through the Christmas tree, and into a production tubing. 
 
     
     
       2. The adapter according to  claim 1 , wherein the at least one feed through, arranged lateral or axial, connects an inside of the adapter to an outside of the adapter, and the well barrier element is a well barrier compliant valve or plug, or a combination thereof. 
     
     
       3. The adapter according to  claim 1 , wherein the feed-through is configured to convey at least one of: electric communication, optical communication, hydraulic liquid, and gas, in any combination. 
     
     
       4. The adapter according to  claim 1 , wherein said string encloses lines, cables and tubes, said string being suspended from the lower well barrier within the adapter, wherein the lower well barrier is the well barrier element, the combined hanger and plug or the plug within said Christmas tree or said adapter. 
     
     
       5. The adapter according to  claim 1 , wherein said feed-through extends laterally through a sidewall of said adapter. 
     
     
       6. The adapter according to  claim 1 , wherein said feed-through extends vertically through a cap on top of said adapter. 
     
     
       7. The adapter according to  claim 1 , wherein said feed-through is arranged below said well barrier element. 
     
     
       8. The adapter according to  claim 1 , wherein the adapter comprises two well barriers and said feed-through is arranged between said two well barriers. 
     
     
       9. The adapter according to  claim 1 , wherein the first interface comprises a Christmas tree connector either adapted to interface with a tubing hanger of the Christmas tree, for connecting to horizontal Christmas trees, or with an inside of a Christmas tree spool, for connecting to vertical Christmas trees. 
     
     
       10. The adapter according to  claim 1 , wherein the adapter is a high-pressure unit capable of withstanding well pressure. 
     
     
       11. The adapter according to  claim 1 , wherein the second interface is an H4 profile. 
     
     
       12. An oil or gas field Christmas tree having an adapter, the adapter comprising:
 a first interface connected to a Christmas tree interface on a top of the Christmas tree and a second interface identical to the Christmas tree interface arranged at an end of the adapter opposite of said first interface; 
 the adapter further comprising at least one feed-through configured to convey electric power to a pump unit via a cable; 
 the pump unit being suspended into a production tubing from a hanger within the adapter via a string, wherein the string comprises the cable and extends from the hanger, through the Christmas tree, and into the production tubing; and 
 the adapter comprising a plug arranged in a through-channel of the adapter, the plug arranged to form a pressure barrier in the through-channel. 
 
     
     
       13. The oil or gas field Christmas tree adapter according to  claim 12 , wherein the hanger and the plug are a combined hanger and plug arranged in the through-channel. 
     
     
       14. The oil or gas field Christmas tree adapter according to  claim 12 , wherein the plug is a first plug forming a first pressure barrier, and the adapter comprises a second plug arranged in the through-channel, the second plug arranged to form a second pressure barrier in the through-channel. 
     
     
       15. The oil or gas field Christmas tree adapter according to  claim 14 , wherein the hanger and the second plug are a combined hanger and plug arranged in the through-channel. 
     
     
       16. The oil or gas field Christmas tree adapter according to  claim 12 , wherein the hanger is arranged in the through-channel. 
     
     
       17. The oil or gas field Christmas tree adapter according to  claim 12 , wherein said feed-through extends laterally through a side wall of said adapter. 
     
     
       18. The oil or gas field Christmas tree adapter according to  claim 12 , wherein said feed-through extends vertically through a cap on top of said adapter. 
     
     
       19. The oil or gas field Christmas tree adapter according to  claim 12 , wherein:
 the first interface comprises a Christmas tree connector; 
 the Christmas tree is a horizontal Christmas tree and the connector interfaces with a tubing hanger of the Christmas tree. 
 
     
     
       20. The oil or gas field Christmas tree adapter according to  claim 12 , wherein:
 the first interface comprises a Christmas tree connector; 
 the Christmas tree is a vertical Christmas tree and the connector interfaces with an inside of a spool of the Christmas tree.